William care foster



(No Model.) 7 2 Sheets-Sheet 1.

W. 0. FOSTER.

SEWING MACHINE.

No. 397,496. Patented Feb. 12, 1889.

WIT SSES: INVENTOR: 'awfl, W6 wa ATTORNEYS.

(No Model.) 2 Sheets-Sheet 2.

W. C. POSTER.

SEWING MAGHINE.

Patented Feb. 12, 1889.

New

INVENTOR BY 5! t ATTORNEYS.

lUNITED STATES PATENT FFICEQ.

IVILLIAM CARR FOSTER, OF JERSEY CITY, NEW JERSEY, ASSIGNOR TO MARI -A.CUMING, OF NEW YORK, N. Y.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 397,496, dated February12, 1889. Application filed April 14, 1838. Serial No. 270,633. (Nomodel.)

To all whom it may concern:

Be it known that I, ILLIAM CARR FOSTER, of Jersey City, in the county ofHudson and State of New Jersey, have invented a new and ImprovedSewing-Machine, of which the following is a full, clear, and exactdescription.

My invention relates to a sewing-machine for forming a double-row seamor whipst-itch, wherein the side loops are bound at the lock formed bythe chain-stitch; and the invention consists,principally, of a hook andmeans for reciprocating it, whereby each side loop or stitch is shiftedlaterally to have the chain-stitch loop thrust through it.

The invention also consists of the construction, arrangement, andcombination of parts, all as hereinafter described and claimed.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure l is a sectional side elevation of an ordinary 'Willcox dz Gibbssewinganachine having my invention applied thereto. Fig. 2 is asectional side elevation of the same, taken on the line x a: of Fig. 1.Fig. 3 is a detailed sectional view on line 1 1 of Fig. 2, showing theneedles in their lowermost position and the hooks just entering theloops. Fig. 4 is a similar view showing the needles elevated and thehooks retaining the loops. Fig. 5 is a similar view showing the needlesat their lowest position again. Fig. 6 shows the upper surface of theseam. Figs. 7 and 8 show the lower surface of the seam; and Fig. 9 is anenlarged view of the horizontally-reciprocatin g hook for retaining theloop, and illustrates the passing of one needle through the said loop inthe descent of the needle.

In forming my new scam I employ two thrc ls, a Z). The thread a isformed into the ordinary chain-stitch made by the W illcoX dc Gibbssewing-machine, while the thread Z) is passed through the fabric andcarried to one side in the form of a loop and bound by surrounding oneof the loops of the chain between the adjacent or connected loop and thefabric. In forming this style of seam or stitch I fit in the needle-barN two needles, A B, for the threads a h, respectively. The needle A isset lower than the needle B, and its eye is at right angles to the lineof the feed, while the eye of the needle B is set in line with the feedand is threaded from the back. The needle A acts in connection with therotating hook O and feed E, in the usual manner, to form thechain-stitch seam D.

F is a horizontally-reciproc'ating bar, held beneath the cloth-plate Gand reciprocated bya cam, ll, secured upon the main shaft J of themachine. The action of the cam His transmitted to the hook-bar F by thelever K, fulcrumed at 70, the stud L, secured to the said lever andentering the groove of the cam, and the pitman-rod 7;, connecting theupper end of the lever with the inner end of the rod F, which is reallya part of the bar F. This rod F enters a sleeve or long bearing, F madefast to the arm. M of the sewing-machine, and the pitman d is connectedto its inner end by a 0 bolt, f. The bolt f, which connects the pitmanIt to the lever K, passes through a slot,f in the said lever, so thatthe outer end of the pitman may be raised and lowered to adjust thestroke of the barFF'. The said bar F is provided with a hook, 6, formedwith a shoulder, 1'', and the groove in the cam II is shaped to1nove-the bar from a position where the hook t' stands, wholly to theright of the needle B, first to the position shown in Fig. 3, where thehook enters the loop formed by the thread I) and dwells. Then the camforces the bar F to the position shown in Fi 1, 4, and 5, and thenwithdraws it to the starting-point.

The first movement of the bar F is timed with the movement of theneedle-bar N and the hook C in such manner that hook engages the threadI) just as its needle is lifted up through the fabric and just as thepoint of the hook C enters the loop of the thread a. 0 The dwell of thebar F now causes the hook e' to retain the thread 1) below the fabricuntil the needles start to descend. Then the bar F moves forward to theposition shown in Figs. 4 and 5,forming a loop, (Z, in'the thread 5 Z),and at the same time carrying it by means of the shoulder 2" to a pointimmediately below the needle A, and this is done just in time so thatthe needle A will pass through the said loop (1, as illustrated in Figs.5 and 9. I00 The needle A having penetrated the loop (I, the bar F iswithdrawn. to its original position,

d are held close to the under side 'of the fabric and held also fromlateral movement.

The cloth-plate G is formed with a slot, 6, for the two needles A B, andthe needle-bar is reciprocated by the needle-arm M, eccentric M, andconnecting-rod M in the usual manner, and the feed E is operated by aneccentric, J, on the shaft J in the usual manner, and the machine isprovided with a tension, N for each thread a b and suitable guide loops,1% and m, for each thread.

Reference is hereby made to my application for Letters Patent filedOctober 25, 1887, and

numbered 253,295, wherein I have claimed the special method of formingthe seam employing the mechanism claimed herein.

Having thus described my invention, What I claim as new, and desire tosecure by Letters Patent, is

The needle-bar N, provided with two needles, and the cloth-plate G,having the needle hole or slot 6 for both needles, in combination withstitch-forming hook C, the bar F, placed beneath'the cloth-plate in linewith the needles, and means, substantially as described, forreciprocating said bar F, the same being formed or provided with a hookor point, 2', to enter the'loop, and with the shoulder t", to shift theloop, substantially as described.

WILLIAM CARR FOSTER.

WVitnesses:

EUGENE OHEVALLIER, HENRY SIEBERT.

